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THE COMPANY AND BASIS OF PREPARATION. (Impact on Condensed Consolidated Statements of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Condensed Income Statements, Captions [Line Items]          
Investment advisory fees $ 1,189.2 $ 1,158.2 $ 1,098.9 $ 1,046.0 $ 992.7
Administrative, distribution, and servicing fees 138.8 139.4 139.8 140.0 139.9
Net revenues 1,328.0 1,297.6 1,238.7 1,186.0 1,132.6
Compensation and related costs 441.4 446.3 417.4 403.8 397.4
Distribution and servicing 70.3 70.6 67.4 64.8 59.8
Advertising and promotion 24.6 34.0 14.0 18.7 25.7
Product-related costs 42.1 35.1 37.9 34.4 38.6
Technology, occupancy, and facility costs 94.1 95.8 86.3 85.6 82.8
General, administrative, and other 71.7 84.8 67.2 71.1 56.6
Nonrecurring insurance recoveries related to Dell appraisal rights matter 0.0     0.0 (50.0)
Total operating expenses 744.2 766.6 690.2 678.4 610.9
Net operating income $ 583.8 531.0 548.5 507.6 521.7
As previously reported [Member]          
Condensed Income Statements, Captions [Line Items]          
Investment advisory fees   1,156.0 1,096.7 1,043.9 991.1
Administrative, distribution, and servicing fees   130.1 125.0 127.7 122.5
Net revenues   1,286.1 1,221.7 1,171.6 1,113.6
Compensation and related costs   446.3 417.4 403.8 397.4
Distribution and servicing   38.0 37.4 36.4 35.2
Advertising and promotion   33.8 14.0 18.6 25.6
Product-related costs   0.0 0.0 0.0 0.0
Technology, occupancy, and facility costs   90.4 84.0 83.1 81.0
General, administrative, and other   146.6 120.4 122.1 102.7
Nonrecurring insurance recoveries related to Dell appraisal rights matter       0.0 (50.0)
Total operating expenses   755.1 673.2 664.0 591.9
Net operating income   531.0 548.5 507.6 521.7
Adjustment [Member] | Impact of ASC 606 [Member]          
Condensed Income Statements, Captions [Line Items]          
Investment advisory fees   2.2 2.2 2.1 1.6
Administrative, distribution, and servicing fees   9.3 14.8 12.3 17.4
Net revenues   11.5 17.0 14.4 19.0
Compensation and related costs   0.0 0.0 0.0 0.0
Distribution and servicing   2.4 2.1 2.0 1.7
Advertising and promotion   0.2 0.0 0.1 0.1
Product-related costs   9.1 14.5 12.0 17.2
Technology, occupancy, and facility costs   (0.1) 0.1 0.0 0.0
General, administrative, and other   (0.1) 0.3 0.3 0.0
Nonrecurring insurance recoveries related to Dell appraisal rights matter       0.0 0.0
Total operating expenses   11.5 17.0 14.4 19.0
Net operating income   0.0 0.0 0.0 0.0
Adjustment [Member] | Change in presentation [Member]          
Condensed Income Statements, Captions [Line Items]          
Investment advisory fees   0.0 0.0 0.0 0.0
Administrative, distribution, and servicing fees   0.0 0.0 0.0 0.0
Net revenues   0.0 0.0 0.0 0.0
Compensation and related costs   0.0 0.0 0.0 0.0
Distribution and servicing   30.2 27.9 26.4 22.9
Advertising and promotion   0.0 0.0 0.0 0.0
Product-related costs   26.0 23.4 22.4 21.4
Technology, occupancy, and facility costs   5.5 2.2 2.5 1.8
General, administrative, and other   (61.7) (53.5) (51.3) (46.1)
Nonrecurring insurance recoveries related to Dell appraisal rights matter       0.0 0.0
Total operating expenses   0.0 0.0 0.0 0.0
Net operating income   $ 0.0 $ 0.0 $ 0.0 $ 0.0